It has long been a pet peeve of mine when people talk about apes calling them "monkeys".
Recently I've seen bonobos being called 猿 in an anime, so from that it's pretty clear that 猿 also refers to apes informally in Japanese. So I've been wondering:
Does 猿 also mean ape in technical/scientific Japanese speech?
From what I was able to gather from Wikipedia and dictionaries, apes (Hominoidea) are ヒト上科 and great apes (Hominidae, which is what a bonobo is) are called ヒト科.
But that does not clarify whether 猿 can be used technically to refer to them, or even if 猿 is accepted nomenclature in scientific/technical speech at all.